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  • 5/19/2018 PM1772EN Allison

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    PM1772EN

    PreventiveMaintenance

    CL(B)T/HT 750 SeriesOil Field Applications

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    Allison TransmissionVOCATIONAL MODELS

    Preventive

    Maintenance

    1985 MAYRev. 1 2000 January

    PM1772EN

    CLT 750

    CLBT 750

    CLBT 750DB

    HT 750DR

    HT 750DR DB

    Printed in USA Copyright 2007 Allison Transmission, Inc.

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    ii

    WARNINGS, CAUTIONS, AND NOTES

    IT IS YOUR RESPONSIBILITY to be completely familiar with the warnings and

    cautions described in this handbook. It is, however, important to understand that

    these warnings and cautions are not exhaustive. Allison Transmission could not

    possibly know, evaluate, and advise the service trade of all conceivable ways inwhich service might be done or of the possible hazardous consequences of each

    way. Consequently, Allison Transmission has not undertaken any such broad

    evaluation. Accordingly, ANYONE WHO USES A SERVICE PROCEDURE OR

    TOOL WHICH IS NOT RECOMMENDED BY ALLISON TRANSMISSION

    MUST first be thoroughly satisfied that neither personal safety nor equipment safety

    will be jeopardized by the service methods selected.

    Proper service and repair is important to the safe, reliable operation of the

    equipment. The service procedures recommended by Allison Transmission anddescribed in this handbook are effective methods for performing service operations.

    Some of these service operations require the use of tools specially designed for the

    purpose. The special tools should be used when and as recommended.

    Three types of headings are used in this manual to attract your attention. These

    warnings and cautions advise of specific methods or actions that can result in personal

    injury, damage to the equipment, or cause the equipment to become unsafe.

    TRADEMARKS USED

    Loctiteis a registered trademark of the Loctite Corporation

    Teflonis a registered trademark of the DuPont Corporation

    Vitonis a registered trademark of the DuPont Corporation.

    WARNING:A warning is used when an operating procedure, practice,etc., if not correctly followed, could result in personal injury or loss of life.

    CAUTION:A caution is used when an operating procedure,practice, etc., if not strictly observed, could result in damage to ordestruction of equipment.

    NOTE: A note is used when an operating procedure, practice, etc., is

    essential to highlight.

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    TABLE OF CONTENTS

    Paragraph Description Page

    Section I REMOVING TRANSMISSION FROM VEHICLE

    11. Draining Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    12. Disconnecting Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    13. Uncoupling From Driveline And Engine. . . . . . . . . . . . . . . . . . 2

    14. Removing Mounting Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    15. Removing The Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

    16. Removing Input And Output Flange Or Yokes . . . . . . . . . . . . . 3

    17. Rebuild/Overhaul Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 3

    Section II PREPARING TRANSMISSION FOR INSTALLATION

    21. Checking Flywheel (Engine-Mounted Models). . . . . . . . . . . . . 4

    22. Installing Brake And Output Flange . . . . . . . . . . . . . . . . . . . . . 4

    23. Installing Input Flange (Remote-Mounted) . . . . . . . . . . . . . . . . 5

    24. Installing Range Selector Lever. . . . . . . . . . . . . . . . . . . . . . . . . 5

    25. Installing PTO (Applicable at Any Location) . . . . . . . . . . . . . . 6

    26. Installing Shift Modulation Control. . . . . . . . . . . . . . . . . . . . . . 627. Installing Oil Filler Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    Section III PREPARING VEHICLE FOR TRANSMISSIONINSTALLATION

    31. Checking Flexplate Drive Assembly

    (Transmission Engine-Mounted) . . . . . . . . . . . . . . . . . . . . . . . . 8

    32. Checking Input Drive Components(Transmission Remote-Mounted) . . . . . . . . . . . . . . . . . . . . . . . 8

    33. Checking Chassis And Driveline . . . . . . . . . . . . . . . . . . . . . . . . 9

    34. Oil Cooler, Oil Filter, And Lines . . . . . . . . . . . . . . . . . . . . . . . . 9

    35. Checking Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

    Section IV INSTALLING TRANSMISSION INTO VEHICLE

    41. Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

    42. Mounting To Engine (Transmission Engine-Mounted). . . . . . 11

    43. Installing Transmission Mounting Components . . . . . . . . . . . 12

    44. Rear Support Of The CLBT 750DB . . . . . . . . . . . . . . . . . . . . 12

    45. Coupling To Engine (Transmission Remote-Mounted). . . . . . 13

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    Paragraph Description Page

    Section IV INSTALLING TRANSMISSION INTO VEHICLE (contd)

    46. Coupling To Driveline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    47. Connecting Cooler And Oil Filter Lines . . . . . . . . . . . . . . . . . 14

    48. Connecting Range Selector Control. . . . . . . . . . . . . . . . . . . . . 16

    49. Connecting Hydraulic Retarder Control (CLBT Models) . . . . 17

    410. Connecting Modulator Control . . . . . . . . . . . . . . . . . . . . . . . . 17

    411. Connecting Power Takeoff Controls . . . . . . . . . . . . . . . . . . . . 20

    412. Connecting Parking Brake Controls . . . . . . . . . . . . . . . . . . . . 21

    413. Connecting Output Disconnect Controls

    (Dropbox Models Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

    414. Connecting Speedometer Drive . . . . . . . . . . . . . . . . . . . . . . . . 21

    415. Installing Temperature And Pressure

    Sensors And Electrical Components . . . . . . . . . . . . . . . . . . . . 21

    416. Filling The Oil System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    SECTION V OIL SYSTEM

    51. Filling The System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

    52. Deep Oil Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2353. Oil Pan Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

    54. Spare Parts Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    55. Installation Of The 812Inch Transmission Oil Pan Assembly

    and Oil Filler Tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

    56. Oil Level And Oil Dipstick . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

    57. Checking Transmission Oil Level . . . . . . . . . . . . . . . . . . . . . . 27

    58. Oil Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2859. Oil Change And Filter Replacement . . . . . . . . . . . . . . . . . . . . 28

    510. Oil Operating Temperatures. . . . . . . . . . . . . . . . . . . . . . . . . . . 29

    511. Oil Level For Transfer Gear Housing (Dropbox) . . . . . . . . . . 29

    Section VI DUAL MODE OPERATION

    61. General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

    62. Functional Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    63. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    64. Downshift Inhibiting CL(B)T 750 (2100 And 2300 rpm

    Dropbox Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

    65. CLBT 750 Dual Mode Transmission With Dropbox. . . . . . . . 36

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    Paragraph Description Page

    Section VII RELEASE OF STEP GOVERNOR VALVE BODYASSEMBLY P/N 23010297

    71. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

    72. Interchangeability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

    73. Spare Parts Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

    Section VIII MANUAL/AUTOMATIC OPERATION ON OIL FIELDEQUIPMENT

    81. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

    82. Mannesmann Rexroth Corporation Shifter . . . . . . . . . . . . . . . 38

    83. Bennett Shifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

    84. Preventive Maintenance On Shifters . . . . . . . . . . . . . . . . . . . . 46

    85. Mode Shift Valves Used In Mannesmann Rexroth And

    Bennett Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

    Section IX TROUBLESHOOTING CLBT 750 WITH DUAL MODE

    91. Pressure Tap Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

    92. Troubleshooting Dual Mode Circuitry. . . . . . . . . . . . . . . . . . . 5193. Step Governor Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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    NOTES

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    11. DRAINING TRANSMISSION

    The transmission should be drained before it is removed from the vehicle.

    Remove the oil drain plug from the rear of the transmission oil pan. Examinethe drained oil for evidence of water or debris that indicates failure of internal

    components.

    Reinstall the oil drain plug.

    R